HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\outlook\pst

PST Null Data on Delete
- HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\outlook\pst\pstnullfreeondelete
Permanently remove all deleted content from PST and OST files
- HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\outlook\pst\pstnullfreeonclose
Legacy PST: Size to disable adding new content
- HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\outlook\pst\warnfilesize
Legacy PST: Absolute maximum size
- HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\outlook\pst\maxfilesize
Large PST: Size to disable adding new content
- HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\outlook\pst\warnlargefilesize
Large PST: Absolute maximum size
- HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\outlook\pst\maxlargefilesize
Prevent users from adding new content to existing PST files
- HKEY_CURRENT_USER\software\policies\microsoft\office\16.0\outlook\pst\pstdisablegrow